Coupler nut length

On the parts list, it calls for a 7/8" long coupler nut. The only one they had at my local big box store was considerably longer than that. Will this cause me issues, or can I work with it? If I need to source one from online, does anyone have a suggestion for me?

Thanks in advance.

I just cut it down with my Dremel.

Assuming that I need to trim it equally from both ends?